Apologies if this is in the wrong group, but I need some help. I have been
developing with a DataGrid and OleDb and everything is fine, except that when
I want to sort columns (which is fine ordinarily) it forgets the sorting
information when I tell the grid that I want to edit.
I am using a form level variable to hold the ordering part of the SQL
statement, but it doesn't use it when I click (and run) the grid editing
procedure - I really can't see why it will not remember it (it is probably
just me being thick though!).
It's anoying, everything is fine except that if I wanted to sort the grid,
then edit an item, it resorts the grid back to it's default state!
My code is below, and any help would be great! Thanks, James.
<%@ Page Language="VB" %>
<%@ Register TagPrefix="wmx" Namespace="Microsoft.Matrix.Framework.Web.UI"
Assembly="Microsoft.Matrix.Framework, Version=0.6.0.0, Culture=neutral,
PublicKeyToken=6f763c9966660626" %>
<%@ import Namespace="System.Data.OleDb" %>
<script runat="server">
' Insert page code here
'
dim dbconn as new OleDbConnection
dim dbcommand as new OleDbCommand
Dim gSortExpr as string
sub Page_Load
IF NOT Page.IsPostback then
'Using textbox1 for debugging.
textbox1.text = "NOT Postback: " & gSortExpr
bindGrid(gSortExpr)
else
textbox1.text = "POSTBACK:" & gSortExpr
end if
end sub
sub bindGrid()
dbconn.connectionstring =
("Provider=Microsoft.Jet.OLEDB.4.0;data source=c:\test.mdb")
dbconn.Open()
dbcommand.commandtext = "SELECT * FROM tblPerson " & gSortExpr
dbcommand.connection = dbconn
dim dbreader as OleDbDataReader = dbcommand.executereader()
Try
dtgPerson.DataSource = dbReader
dtgPerson.DataBind()
Finally
' always call Close when done reading.
dbReader.Close()
dbconn.Close()
End Try
lblStatus.text = lExpr
end sub
sub expandPersonDetails(sender as Object, e as DataGridCommandEventArgs)
'runs when Details link is clicked
end sub
sub runSort(sender as Object, e as DataGridSortCommandEventArgs)
'runs when the grid is sorted.
gSortExpr = e.SortExpression
bindGrid()
end sub
sub dtgPerson_Edit(sender As Object, e As DataGridCommandEventArgs)
dtgPerson.EditItemIndex = e.Item.ItemIndex
bindGrid()
'lblStatus.text = "Edit Mode On"
'runs when edit button is clicked
end sub
sub dtgPerson_Update(sender As Object, e As DataGridCommandEventArgs)
Dim strid as integer = e.Item.Cells(1).Text
Dim strfName as String = CType(e.Item.Cells(2).Controls(0),
TextBox).Text
Dim strsName as String = CType(e.Item.Cells(3).Controls(0),
TextBox).Text
dbconn.connectionstring = ("Provider=Microsoft.Jet.OLEDB.4.0;data
source=c:\test.mdb")
dbconn.Open()
dbcommand.commandtext = "UPDATE tblPerson SET PersonFname = '" &
strfName & "', PersonSname = '" & strsName & "' WHERE PersonID = " & strid
dbcommand.connection = dbconn
try
dbcommand.executenonquery()
finally
dbconn.Close()
End Try
dtgPerson.EditItemIndex = -1
BindGrid()
lblStatus.text = "Data Updated. Data View Mode On"
end sub
sub dtgPerson_Cancel(sender As Object, e As DataGridCommandEventArgs)
dtgPerson.EditItemIndex = -1
bindGrid()
'runs when edit button is clicked
end sub
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<p>
<asp:DataGrid id="dtgPerson" runat="server"
OnCancelCommand="dtgPerson_Cancel" OnUpdateCommand="dtgPerson_Update"
OnEditCommand="dtgPerson_Edit" OnSortCommand="runSort" AllowSorting="True"
OnItemCommand="expandPersonDetails" EditItemStyle-BackColor="#00ffff"
Backcolor="#eeeeee" AutoGenerateColumns="False">
<HeaderStyle backcolor="Black" forecolor="White"
font-bold="True" horizontalalign="Center" />
<AlternatingItemStyle backcolor="White" />
<Columns>
<asp:EditCommandColumn EditText="Edit Info"
ButtonType="PushButton" UpdateText="Update" CancelText="Cancel" />
<asp:BoundColumn DataField="PersonID" HeaderText="Person
ID" ReadOnly="True" SortExpression="ORDER BY PERSONID ASC" />
<asp:BoundColumn DataField="PersonFname"
HeaderText="Given Name" SortExpression="ORDER BY PersonFname ASC" />
<asp:BoundColumn DataField="PersonSname"
HeaderText="Family Name" SortExpression="ORDER BY PersonSname ASC" />
<asp:ButtonColumn Text="Details" HeaderText="FAQ
Details" />
</Columns>
</asp:DataGrid>
</p>
<p>
<asp:Label id="lblStatus" runat="server"></asp:Label>
</p>
<p>
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
</p>
</form>
</body>
</html>
